Crane.



H; A. THOMSON. CRANE.

APPLIOATIDH PILBD JUNE 20. 1806.

PATENTED OUT. 15, 1907.

2 SHEETS-SHEET 1.

IIUGH ALEXANDER THOMSON, OF SHAWLANDS, SCOTLAND.

CRANE Specification of Letters Patent.

Patented Oct. 15, 1907.

Application filed June 20,1906. Serial No. 322,576-

To all whom it may concern:

Be it known that I, HUGH ALEXANDER THOMSON, a subject of the King of theUnited Kingdom of Great Britain and Ireland, residing at Shawlands,Renfrew, Scotland, have invented certain new and useful Improvements inCranes, of which the following is a specification.

My invention relates to improvements in cranes and the objects of myimprovements are that the crane members can be safely andquickly'erected and when required to be taken down the several parts canbe easily lowered and disconnected. I attain these objects in the mannerillustrated by the accompanying drawings in which Figure I is a linediagram showing the crane being raised or lowered, and Fig. 2 acorresponding drawing illustrating in detail the connecting joints.

Similar figures refer to similar parts throughout the several views.

The crane consists of a mast 1 with the usual hoisting gear 21, pulleys19, lifting tackle 2, 20, bed-plate 3, turn-tableA, jib 5, two guys 6, 6and two sleepers 7 and 7 On the metal bed plate 3 to which the ends ofthe sleepers are fixed the turn-table 4 with its dome shaped bearing ispivoted.

The crane mast l is centered at the top to rotate on the pin 8 and eachleg of the mast will be hinged at the foot to the turn-table 4 by thepin 18.

To the top of the mast the connecting-pieces 9 dz- 9 are pivoted on thepin 8 and to these pieces the ends of the guys 6 and 6 will be hinged onpins one of which 11 is shown, the other ends of the guys being pivotedmast 1 with its attached hoisting gear to lie in a horizontal orupwardly inclined position. To the mast 1 and sleeper 7 I would connectone of the guys 6. The jib 5 would then be hinged to the turn-table 4 bythe pin 12 and also securely anchored to lie in a horizontal or upwardlyinclined position. By means of the hoisting gear 21 and lugging tackle 2fixed to the jib at 22 shown at Fig. 1 the mast 1 and guy 6 would beraised by hand power to the vertical position fold- 'ing on the sleeper7 while the other guy 6 is being guided to the fixing block 14 onthe-sleeper 7.

To facilitate the raising of the crane when the mast and jib are lyinghorizontally it would be necessary to carry the lugging rope 2 over astrut 15 as shown. This angle iron strut can be folded to lie on themast when not in use.

To lower the crane set the jib horizontally and square to eithersleeper, the square being proved by the entrance of the lug 16 into thegroove 17, and then disconnecting the guy in line with the jib lower themast and its attached guy over the strut 15 by means of the hoistinggear 21 and tackle 2 as shown at Fig. 1.

Having now described my invention what I claim and desire to secure byLetters Patent of the United States is:

1. A crane comprising in combination a mast, guys at tached to the topof said mast, and a turntable to which the foot of said mast is hingedas described.

2. A crane consisting of a mast and sleepers in combination with guysattached to the top of the mast and each pivutally engaging oneof saidsleepers, and a turntable to which the foot of said mast is hinged asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HUGH ALEXANDER THOMSON. Witnesses WALLACE FAIRWEATHER, JNO. ARMSTRONG,Junr.

